scholarly journals Reducing the pulse repetition rate of picosecond dissipative soliton passively mode-locked fiber laser

2019 ◽  
Vol 27 (3) ◽  
pp. 2809 ◽  
Author(s):  
Qiao Lu ◽  
Jindong Ma ◽  
Dian Duan ◽  
Xuechun Lin ◽  
Qinghe Mao
Keyword(s):  
Fiber Laser ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition ◽  
Dissipative Soliton

Pulse-repetition-rate tuning of a harmonically mode-locked fiber laser using a tapered photonic crystal fiber

2019 ◽  
Vol 44 (7) ◽  
pp. 1580 ◽  
Author(s):  
Dung-Han Yeh ◽  
Wenbin He ◽  
Meng Pang ◽  
Xin Jiang ◽  
Gordon Wong ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Fiber Laser ◽  
Photonic Crystal Fiber ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition ◽  
Crystal Fiber

scholarly journals The Influence of the Processing Parameters on the Laser-Ablation of Stainless Steel and Brass during the Engraving by Nanosecond Fiber Laser

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 232
Author(s):  
Luka Hribar ◽  
Peter Gregorčič ◽  
Matej Senegačnik ◽  
Matija Jezeršek
Keyword(s):  
Surface Roughness ◽  
Fiber Laser ◽  
Pulse Duration ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Removal Rate ◽  
Average Power ◽  
Laser Pulses ◽  
Processing Parameters ◽  
Pulse Repetition

In this paper, we investigate the influence of the following parameters: pulse duration, pulse repetition rate, line-to-line and pulse-to-pulse overlaps, and scanning strategy on the ablation of AISI 316L steel and CuZn37 brass with a nanosecond, 1064-nm, Yb fiber laser. The results show that the material removal rate (MRR) increases monotonically with pulse duration up to the characteristic repetition rate (f0) where pulse energy and average power are maximal. The maximum MRR is reached at a repetition rate that is equal or slightly higher as f0. The exact value depends on the correlation between the fluence of the laser pulses and the pulse repetition rate, as well as on the material properties of the sample. The results show that shielding of the laser beam by plasma and ejected material plays an important role in reducing the MRR. The surface roughness is mainly influenced by the line-to-line and the pulse-to-pulse overlaps, where larger overlap leads to lower roughness. Process optimization indicates that while operating with laser processing parameters resulting in the highest MRR, the best ratio between the MRR and surface roughness appears at ~50% overlap of the laser pulses, regardless of the material being processed.

Elemental analysis of copper alloys with laser-ablation spark-induced breakdown spectroscopy based on a fiber laser operated at 30 kHz pulse repetition rate

2019 ◽  
Vol 34 (9) ◽  
pp. 1838-1845 ◽  
Author(s):  
Yinhua Jiang ◽  
Runhua Li ◽  
Yuqi Chen
Keyword(s):  
Laser Ablation ◽  
Fiber Laser ◽  
Elemental Analysis ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Copper Alloys ◽  
Spark Discharge ◽  
Pulse Repetition ◽  
Analytical Sensitivity ◽  
Breakdown Spectroscopy

The analytical sensitivity of a compact LIBS system consisting of a fiber laser and a fiber spectrometer was successfully improved by the spark discharge.

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